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Publications (10 of 57) Show all publications
Ozolins, O., Pang, X., Iglesias Olmedo, M., Kakkar, A., Udalcovs, A., Gaiarin, S., . . . Jacobsen, G. (2017). 100 GHz Externally Modulated Laser for Optical Interconnects. Journal of Lightwave Technology, 35(6), 1174-1179
Open this publication in new window or tab >>100 GHz Externally Modulated Laser for Optical Interconnects
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2017 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 35, no 6, p. 1174-1179Article in journal (Refereed) Published
Abstract [en]

We report on a 116 Gb/s on-off keying (OOK), four pulse amplitude modulation (PAM) and 105-Gb/s 8-PAM optical transmitter using an InP-based integrated and packaged externally modulated laser for high-speed optical interconnects with up to 30 dB static extinction ratio and over 100-GHz 3-dB bandwidth with 2 dB ripple. In addition, we study the tradeoff between power penalty and equalizer length to foresee transmission distances with standard single mode fiber.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017
Keyword
Direct detection, distributed feedback laser (DFB), electroabsorption modulator, optical interconnects
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-206702 (URN)10.1109/JLT.2017.2651947 (DOI)000399388500004 ()
Note

QC 20170509

Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2017-11-02Bibliographically approved
Hong, X., Ozolins, O., Guo, C., Pang, X., Zhang, J., Navarro, J. R., . . . Chen, J. (2017). 1.55-jnm EML-based DMT transmission with nonlinearity-aware time domain super-nyquist image induced aliasing. In: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings: . Paper presented at 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>1.55-jnm EML-based DMT transmission with nonlinearity-aware time domain super-nyquist image induced aliasing
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2017 (English)In: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2017Conference paper (Refereed)
Abstract [en]

We experimentally demonstrate a DMT transmission system with 1.55-μm EML using nonlinearity-aware time domain super-Nyquist image induced aliasing. Compared with linear equalization, the capacity is improved by ∼16.8%(33.1%) with proposed method for 4(40) km transmission.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2017
Keyword
Optical fibers, Aliasing, Linear equalization, Nyquist, Time domain, Transmission systems, Optical fiber communication
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-216490 (URN)2-s2.0-85025827916 (Scopus ID)9781943580231 (ISBN)
Conference
2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017
Note

Funding details: CSC, China Scholarship Council; Funding details: 61307090, NSFC, National Natural Science Foundation of China; Funding details: 61550110240, NSFC, National Natural Science Foundation of China; Funding details: 61605047, NSFC, National Natural Science Foundation of China; Funding details: 61671212, NSFC, National Natural Science Foundation of China; Funding text: This work is supported by EIT Digital Royal Garden project, Swedish Research Council, Swedish Foundation for Strategic Research, Göran Gustafsson Stiftelse, China Scholarship Council, and National Natural Science Foundation of China (# 61550110240, 61671212, 61605047, 61307090). The equipment was funded by Knut and Alice Wallenberg foundation.

QC 20171201

Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2017-12-01Bibliographically approved
Hong, X., Ozolins, O., Guo, C., Pang, X., Zhang, J., Navarro, J. R., . . . Chen, J. (2017). 1.55-mu m EML-based DMT Transmission with Nonlinearity-Aware Time Domain Super-Nyquist Image Induced Aliasing. In: 2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC): . Paper presented at Optical Fiber Communications Conference and Exhibition (OFC), MAR 19-23, 2017, Los Angeles, CA. IEEE
Open this publication in new window or tab >>1.55-mu m EML-based DMT Transmission with Nonlinearity-Aware Time Domain Super-Nyquist Image Induced Aliasing
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2017 (English)In: 2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

We experimentally demonstrate a DMT transmission system with 1.55-mu m EML using nonlinearity-aware time domain super-Nyquist image induced aliasing. Compared with linear equalization, the capacity is improved by similar to 16.8%(33.1%) with proposed method for 4(40) km transmission.

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-210951 (URN)000403405800245 ()978-1-943580-23-1 (ISBN)
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 19-23, 2017, Los Angeles, CA
Note

QC 20170713

Available from: 2017-07-13 Created: 2017-07-13 Last updated: 2017-07-13Bibliographically approved
Zhang, L., Pang, X., Ozolins, O., Udalcovs, A., Schatz, R., Westergren, U., . . . Chen, J. (2017). Digital mobile fronthaul employing differential pulse code modulation with suppressed quantization noise. Optics Express, 25(25), 31921-31936
Open this publication in new window or tab >>Digital mobile fronthaul employing differential pulse code modulation with suppressed quantization noise
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2017 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 25, p. 31921-31936Article in journal (Refereed) Published
Abstract [en]

A differential pulse code modulation (DPCM) based digital mobile fronthaul architecture is proposed and experimentally demonstrated. By using a linear predictor in the DPCM encoding process, the quantization noise can be effectively suppressed and a prediction gain of 7 similar to 8 dB can be obtained. Experimental validation is carried out with a 20 km 15-Gbaud/lambda 4-level pulse amplitude modulation (PAM4) intensity modulation and direct detection system. The results verify the feasibility of supporting 163, 122, 98, 81 20-MHz 4, 16, 64, 256 QAM based antenna-carrier (AxC) containers with only 3, 4, 5, 6 quantization bits at a sampling rate of 30.72MSa/s in LTE-A environment. Further increasing the number of quantization bits to 8 and 9, 1024 quadrature amplitude modulation (1024 QAM) and 4096 QAM transmission can be realized with error vector magnitude (EVM) lower than 1% and 0.5%, respectively. The supported number of AxCs in the proposed DPCM-based fronthaul is increased and the EVM is greatly reduced compared to the common public radio interface (CPRI) based fronthaul that uses pulse code modulation. Besides, the DPCM-based fronthaul is also experimentally demonstrated to support universal filtered multicarrier signal that is one candidate waveform for the 5th generation mobile systems.

Place, publisher, year, edition, pages
Optical Society of America, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-220601 (URN)10.1364/OE.25.031921 (DOI)000417591100100 ()29245861 (PubMedID)2-s2.0-85038213036 (Scopus ID)
Note

QC 20180116

Available from: 2018-01-16 Created: 2018-01-16 Last updated: 2018-02-20Bibliographically approved
Kakkar, A., Rodrigo Navarro, J., Pang, X., Ozolins, O., Schatz, R., Westergren, U., . . . Popov, S. (2017). Low Complexity Timing Recovery Algorithm for PAM-8 in High Speed Direct Detection Short Range Links. In: 2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC): . Paper presented at Optical Fiber Communications Conference and Exhibition (OFC), MAR 19-23, 2017, Los Angeles, CA. IEEE
Open this publication in new window or tab >>Low Complexity Timing Recovery Algorithm for PAM-8 in High Speed Direct Detection Short Range Links
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2017 (English)In: 2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

We propose a low complexity timing algorithm for high order PAM. Experimental results demonstrate higher performance and lower complexity than conventional algorithms in a 32 Gbaud PAM-8 transmission over 4 kin SMF links.

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-210952 (URN)10.1364/OFC.2017.W2A.54 (DOI)000403405800606 ()2-s2.0-85019901899 (Scopus ID)978-1-943580-23-1 (ISBN)
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 19-23, 2017, Los Angeles, CA
Note

QC 20170713

Available from: 2017-07-13 Created: 2017-07-13 Last updated: 2017-11-02Bibliographically approved
Verplaetse, M., Lin, R., Van Kerrebrouck, J., Ozolins, O., De Keulenaer, T., Pang, X., . . . Yin, X. (2017). Real-Time 100 Gb/s Transmission Using Three-Level Electrical Duobinary Modulation for Short-Reach Optical Interconnects. Journal of Lightwave Technology, 35(7), 1313-1319
Open this publication in new window or tab >>Real-Time 100 Gb/s Transmission Using Three-Level Electrical Duobinary Modulation for Short-Reach Optical Interconnects
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2017 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 35, no 7, p. 1313-1319Article in journal (Refereed) Published
Abstract [en]

Electrical duobinary modulation is considered as a promising way to realize high capacity because of the low bandwidth requirement on the optical/electrical components and high tolerance toward chromatic dispersion. In this paper, we demonstrate a 100 Gb/s electrical duobinary transmission over 2 km standard single-mode fiber reaching a bit error rate under 7% HD-FEC threshold with the use of PRBS7. This link is tested in real-time without any form of digital signal processing. In-house developed SiGe BiCMOS transmitter and receiver ICs are used to drive an electroabsorption modulated laser and decode the received signal from a PIN-photodiode. The performance of 50 and 70 Gb/s nonreturn-to-zero and electrical duobinary transmission are investigated for comparison.

Place, publisher, year, edition, pages
IEEE, 2017
Keyword
Analog equalization, electrical duobinary, optical communication
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-208271 (URN)10.1109/JLT.2016.2643778 (DOI)000399389800004 ()2-s2.0-85018947377 (Scopus ID)
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research
Note

QC 20170614

Available from: 2017-06-14 Created: 2017-06-14 Last updated: 2017-11-02Bibliographically approved
Islam, A. B. & Westergren, U. (2014). Operation of low driving voltage cascaded modulator over non-cascaded modulator for 4 dB extinction ratio at 100 giga bit per second (Gbps). Optik (Stuttgart), 125(22), 6761-6764
Open this publication in new window or tab >>Operation of low driving voltage cascaded modulator over non-cascaded modulator for 4 dB extinction ratio at 100 giga bit per second (Gbps)
2014 (English)In: Optik (Stuttgart), ISSN 0030-4026, E-ISSN 1618-1336, Vol. 125, no 22, p. 6761-6764Article in journal (Refereed) Published
Abstract [en]

This paper describes improved results when comparing cascaded traveling wave electro absorption modulator (TWEAM) to non-cascaded TWEAM by simulation. Large signal modeling is used for both types of modulators to achieve 4 and 10 dB extinction ratios (ERs) with flat frequency response for applications in short distance as well as long distance optical fiber communication. To obtain 4 and 10 dB ERs with 110 GHz 3 dB bandwidth, a cascaded TWEAM requires 0.4V peak to peak (Vp-p) and 1 Vp-p input driving voltages respectively. A non-cascaded TWEAM requires about two times the input driving voltage compared to the cascaded modulator to achieve the same values of ER and 3 dB bandwidth. Both modulators have been simulated with the same bias and also use the same circuit parameters except for the total active segment lengths (1 and 0.5 mm for cascaded and non-cascaded modulator respectively) and microstrip lengths to obtain the same ERs and 3 dB bandwidths.

Keyword
TWEAM, Cascaded modulator, 100 Gbps
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-157579 (URN)10.1016/j.ijleo.2014.07.095 (DOI)000344976300032 ()2-s2.0-84910002126 (Scopus ID)
Note

QC 20141212

Available from: 2014-12-12 Created: 2014-12-11 Last updated: 2017-12-05Bibliographically approved
Chacinski, M., Chitica, N., Schatz, R. & Westergren, U. (2014). Transmission of 40 Gb/s over 55 m multimode fiber using 12 GHz bandwidth system based on vertical-cavity surface-emitting laser. In: Asia Communications and Photonics Conference, ACP: . Paper presented at Asia Communications and Photonics Conference, ACP 2014, 11 November 2014 through 14 November 2014.
Open this publication in new window or tab >>Transmission of 40 Gb/s over 55 m multimode fiber using 12 GHz bandwidth system based on vertical-cavity surface-emitting laser
2014 (English)In: Asia Communications and Photonics Conference, ACP, 2014Conference paper, Published paper (Refereed)
Abstract [en]

Error free transmission (E-12) over 55 m long standard MMF at 40 Gb/s data rate is demonstrated with moderate signal conditioning on the VCSEL. The VCSEL has a-3 dBe bandwidth of 15 GHz resulting in system bandwidth of 12GHz, giving 3.3 bit/s/Hz coding efficiency.

Keyword
Bandwidth, Multimode fibers, Photonics, 40 Gb/s, Bandwidth system, Coding efficiency, Data rates, Error free transmission, System bandwidth, Vertical-cavity surface emitting laser, Surface emitting lasers
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-167881 (URN)2-s2.0-84942369091 (Scopus ID)
Conference
Asia Communications and Photonics Conference, ACP 2014, 11 November 2014 through 14 November 2014
Note

QC 20150615

Available from: 2015-06-15 Created: 2015-05-22 Last updated: 2015-06-15Bibliographically approved
Derksen, R. H. H., Westergren, U., Chacinski, M., Schubert, C., Bach, H.-G., Driad, R., . . . Steffan, A. G. (2013). Cost-Efficient High-Speed Components for 100 Gigabit Ethernet Transmission on One Wavelength Only: Results of the HECTO Project. IEEE Communications Magazine, 51(5), 136-144
Open this publication in new window or tab >>Cost-Efficient High-Speed Components for 100 Gigabit Ethernet Transmission on One Wavelength Only: Results of the HECTO Project
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2013 (English)In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 51, no 5, p. 136-144Article in journal (Refereed) Published
Abstract [en]

In 2010, the standard for 100GbE was approved, which specifies the transmission of 100 Gb/s via 4 wavelength channels of 25 Gb/s each. A solution based on a 100 Gb/s single wavelength channel is capable of significant cost reductions should the required components be available. Within the HECTO project, we developed components suitable for single-wavelength 100 Gb/s transmission. In this article, the project is described - its organization, objectives, possible impacts, and results - including the successful demonstration in a final field trial. A complete ETDM system utilizing the monolithically integrated transmitter and receiver modules developed in the project was built to transmit 112 Gb/s over 42 km standard single-mode fiber. Finally, we attempt an outlook on the prospective development of Ethernet standardization beyond 100GbE.

National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-124046 (URN)10.1109/MCOM.2013.6515058 (DOI)000318998600017 ()2-s2.0-84877873052 (Scopus ID)
Note

QC 20130627

Available from: 2013-06-27 Created: 2013-06-25 Last updated: 2017-12-06Bibliographically approved
Thylén, L., Holmström, P., Wosinski, L., Jaskorzynska, B., Naruse, M., Kawazoe, T., . . . Westergren, U. (2013). Nanophotonics for Low-Power Switches. In: Ivan Kaminow, Tingye Li and Alan Willner (Ed.), Optical FiberTelecommunications VIA: Components and Subsystems (pp. 205-241). Elsevier
Open this publication in new window or tab >>Nanophotonics for Low-Power Switches
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2013 (English)In: Optical FiberTelecommunications VIA: Components and Subsystems / [ed] Ivan Kaminow, Tingye Li and Alan Willner, Elsevier, 2013, p. 205-241Chapter in book (Other academic)
Abstract [en]

This chapter treats several approaches for employing nanophotonics or near-nanophotonics concepts to create low-power switches. The partly interrelated issues of low power dissipation and small device footprint are elucidated and figures of merit for switches formulated. Both optically and electronically controlled optical switches are treated and the crucial role of material development emphasized, illustrated by several examples, including both theoretical analysis of switch concepts and experimentally realized switches. Thus, electronically controlled switches based on hybrid, metamaterial and nanoparticle plasmonics, electrooptic polymers as well as switches based on silicon and photonic crystals are discussed. The all-optical switches focus on third-order nonlinear effects and carrier-induced refractive-index changes in III-V materials, as well as on emerging concepts of near-field-coupled quantum-dot switches. A brief comparison to electronic switches is done.

Place, publisher, year, edition, pages
Elsevier, 2013
Keyword
Components for optical communication, Nanophotonics, Low power switches
National Category
Communication Systems
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-136721 (URN)9780123969583 (ISBN)9780123972354 (ISBN)
Note

QC 20150218

Available from: 2013-12-06 Created: 2013-12-06 Last updated: 2015-02-18Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7056-4379

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